Chapters

23 Chapters | 2:20:28 |

01

Bundles!

6:11
02

KnpMarkdownBundle & Service

7:55
03

Cache Service

5:01
04

Configuring Bundles

6:30
05

The Service Container & Autowiring

6:23
06

Configuring the Cache Service

6:45
07

Environments

9:08
08

Controlling the prod Environment

4:26
09

Creating a Service

5:03
10

Autowiring Dependencies into a Service

6:45
11

Parameters

7:59
12

Service Config & Non-Autowireable Arguments

7:02
13

All about services.yaml

6:21
14

Binding Global Arguments

3:01
15

Named Autowiring

5:18
16

Fetching Non-Autowireable Services

5:58
17

Controllers: Boring, Beautiful Services

2:55
18

Environment Variables

8:29
19

The Secrets Vault

7:39
20

Using & Overriding Secrets

5:21
21

MakerBundle & Autoconfigure

4:42
22

Playing with a Custom Console Command

4:44
23

Making a Twig Extension (Filter)

6:51

> Symfony 5 > Symfony 5 Fundamentals: Services, Config & Environments

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05.

The Service Container & Autowiring

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4 Comments

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Cheshire 3 years ago

I am having a problem with dependency injection in Symfony 5.4 and I have no clue what the problem is....

I am trying to inject entity manager into a constraint validator. It begins like this:

class NoPreviousFreeTrialConstraintValidator extends ConstraintValidator
{
    private $entityManager;

    public function __construct(EntityManager $entityManager)
    {
        $this->entityManager = $entityManager;
    }

And I have the following under services: in my services.yaml file:

App\Validator\NoPreviousFreeTrialConstraintValidator
    arguments:
        - "@doctrine.orm.entity_manager"

However, the constructor is always called with zero arguments when I try to use it. debug:autowiring says there's no autowirable classes or services for that class. What could be going wrong?

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sadikoff Cheshire 3 years ago

Hi

Have you tried to use EntityManagerInterface as a wireable class? also if you have autoconfigure and autowire enabled then you don't need to specify configuration for this class.

Cheers!

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triemli 5 years ago

I would like to aks about peerfomance of autowiring (auto:true). Is it load whole the folder or only when you real use a class? It it make sense to disable autowiring on entities folder with 30-40 classes? Thanks for great tutorials!

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MolloKhan SFCASTS triemli 5 years ago edited

Hey triemli

That's a good question. When you enable autowiring, what it does is to tell Symfony to inject the correct services into your class based on the type-hint or bind-ed variables. This may have a performance impact because it'll have to look up the metadata and other things BUT this happens only once, when the container is compiled, after that, this process is very fast. So, in other words all the heavy work for setting up the container gets cached and dumped into a final file which will be used for the subsequent requests.
I strongly recommend you to enable autowiring and autoconfigure, those features makes working with Symfony a delight.

Cheers!

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This tutorial also works great for Symfony 6!

Symfony 5

What PHP libraries does this tutorial use?

// composer.json
{
    "require": {
        "php": "^7.3.0 || ^8.0.0",
        "ext-ctype": "*",
        "ext-iconv": "*",
        "composer/package-versions-deprecated": "^1.11", // 1.11.99
        "knplabs/knp-markdown-bundle": "^1.8", // 1.9.0
        "sensio/framework-extra-bundle": "^6.0", // v6.2.1
        "sentry/sentry-symfony": "^4.0", // 4.0.3
        "symfony/asset": "5.0.*", // v5.0.11
        "symfony/console": "5.0.*", // v5.0.11
        "symfony/debug-bundle": "5.0.*", // v5.0.11
        "symfony/dotenv": "5.0.*", // v5.0.11
        "symfony/flex": "^1.3.1", // v1.21.6
        "symfony/framework-bundle": "5.0.*", // v5.0.11
        "symfony/monolog-bundle": "^3.0", // v3.6.0
        "symfony/profiler-pack": "*", // v1.0.5
        "symfony/routing": "5.1.*", // v5.1.11
        "symfony/twig-pack": "^1.0", // v1.0.1
        "symfony/var-dumper": "5.0.*", // v5.0.11
        "symfony/webpack-encore-bundle": "^1.7", // v1.8.0
        "symfony/yaml": "5.0.*" // v5.0.11
    },
    "require-dev": {
        "symfony/maker-bundle": "^1.15", // v1.23.0
        "symfony/profiler-pack": "^1.0" // v1.0.5
    }
}

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